基于季冻区SMA改性沥青路面早期破损的研究

Study on Early Failure of SMA Modified Asphalt Pavement in Seasonal Frozen Area

通过对寒冷地区(如哈同、哈双、哈绥和哈尔滨环城)高速公路SMA改性沥青路面表面状况调查,发现省内该调查路段的SMA路面破损状况的PCI指数超标路段较多,而且裂缝和坑槽也不同程度出现,裂缝开裂间距大小不一,挖方到填方路段间距由小到大,绝大多数路段的车辙和平整度等技术指标衰减较快。通过室外车辙、平整度检测与室内马歇尔试验及抽提试验研究,结果表明:车辙、平整度和坑槽是改性沥青路面早期破坏的主要形式,据此分析研究得出SMA路面早期破损的治理对策。

Through the surface situation investigation of SMA modified asphalt pavement in Ha-Tong,Ha-Shuang,Ha-Sui and Harbin city highway,it was indicated that there were many sections with over-standard PCI index,which revealed the damage conditions of SMA pavement.Meanwhile,cracks and pits appeared in different degrees,and the spaces among them were not the same,which become large from excavation sections to fill sections.In most sections,the technical indicators such as tracking and smoothness were attenuated rapidly.Through the outdoor measurement of tracking and smoothness,the indoor Marshall test and extraction test,it was indicated that the tracking,smoothness and pits were main early failure forms of modified asphalt pavement.Based on the study,the treatment measure for SMA pavement＇s early damage was analyzed and proposed.